Diarrhea after meals may be caused by irritable bowel syndrome, gastrointestinal dysfunction, acute gastroenteritis and other diseases. 1. Irritable bowel syndrome: in patients with irritable bowel syndrome, the gastrointestinal tract is very sensitive, and when affected by food stimulation, temperature stimulation and other factors, abdominal pain, diarrhea and other symptoms may lead to symptoms of diarrhea after meals. 2. Gastrointestinal dysfunction: when patients with gastrointestinal dysfunction, gastrointestinal peristalsis is hyperfunctional, and food will stimulate gastrointestinal peristalsis after meals, making it more hyperfunctional, and the water in the food residue can not be absorbed normally, leading to symptoms of diarrhea in patients. 3. Acute gastroenteritis: when patients with acute gastroenteritis, the patient’s gastrointestinal mucosa is damaged, after eating food will stimulate the gastrointestinal mucosa, resulting in the mucosa can not be properly absorbed food water and nutrients, but also make the patient diarrhea symptoms after meals. When the patient occurs after meal diarrhea symptoms, it is best to go to the hospital in time for examination, if the above disease occurs, it can be treated in time to ensure the health of the body.